Slip

Slip
A sideways movement of the head used to evade straight punches and strikes. The idea is to avoid the punch while staying in range to quickly counter attack. Push off the floor with the foot opposite the direction you are moving, slightly rotating the upper body and shifting your head to the side. Move just enough to evade the punch. 

It is generally safer to slip to the outside of your opponent's punch as you are a little less succeptable to the opposite hand punch, but this isn't a black and white rule. 

-Lead Side Slip - Slipping to the side of your lead foot.
-Rear Side Slip - Slipping to the side of your rear foot.

Canelo Alvarez - rear side slip with counter cross

*Fight Smart Trav technique example

Beyond Basics

Slip With Footwork/Stepping

-Lead Side Slip with Lead Angled Step Forward  *example

(Note: I would usually only do this when simultaneously throwing a rear cross and the step would be angled)

-Rear Side Slip with Lead Step Forward *example

-Lead Side Slip with Lead Step To The Side (Left) *example *example

-Rear Side Slip with Rear Step To The Side (Right) *example

-Rear Side Slip with Switch Step To Slide Step *example

All these options will be followed up with some motion to return to your stance and or reface your opponent. For instance, the lead side slip with lead step to the side (left) might be followed by a front foot pivot to reface your opponent. 

Slipping With A Punch

You generally move your head to the rear side when throwing a lead arm punch and move your head to the lead side when throwing a rear arm punch. Offensive examples are described in some of the sections discussing the various punches under Fundamentals: Offensive Strikes. Defensive examples are discussed with the Slip Series in the Counter Attack: Evasions section. 

Slipping After A Punch

Slipping after a punch is used to get your head off line and evade a potential counter strike from your opponent (proactive defense).  You can slip to either the same side of the arm you just punched with or to the opposite side. Generally, the same side slip is most prevalent and natural feeling but both are important. 

-Lead Hand Punch->Same Side Slip *example

-Lead Hand Punch-> Opposite Side Slip *example *example

-Rear Hand Punch->Same Side Slip

-Rear Hand Punch->Opposite Side Slip

Slipping With Parry

Some people incorporate a parry along with there slip. The advantage of combining the two is that you essentially have a double layer of defense. The disadvantage is that you may misinterpret the incoming strike or your opponent feints and attacks on the outside line.